Which of the following gives the chromyl chlo | vedclass

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(A) The chromyl chloride test is a qualitative test used to detect the presence of chloride ions $(Cl^-)$ in a sample. In this test,a chloride salt is

Vedclass · Accepted Answer

$KCl$

Vedclass · Answer

(A) The chromyl chloride test is a qualitative test used to detect the presence of chloride ions $(Cl^-)$ in a sample. In this test,a chloride salt is heated with potassium dichromate $(K_2Cr_2O_7)$ and concentrated sulfuric acid $(H_2SO_4)$. If chloride ions are present,they react to form chromyl chloride $(CrO_2Cl_2)$,which is a deep red vapor. This test is specifically applicable to ionic chlorides. $KCl$ is an ionic chloride and readily gives this test. $PbCl_2$ and $HgCl_2$ are covalent in nature and do not provide the necessary chloride ions in the reaction mixture to form chromyl chloride. Therefore,only $KCl$ gives the chromyl chloride test.

Which of the following gives the chromyl chloride test?

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